[CA] E120 data feed, move from Seatalk 1 to Seatalk ng

[lotharjt]

Hi Chuck,

Success!

As you recommended, the key was to dig into how the RS125 sensor was wired and get it on a more direct path, ie, output to Seatalk 1 rather than NMEA 0183. In the process, I found several peculiar wiring paths that must have been the root issue.

So RS125 is now wired for Seatalk 1 output, NG bus has a direct 12 V source and is also powering the Seatalk 1 bus. Seatalk 1 to NG converter provides the path for GPS data to the NG bus and feeds the master E120 directly.

A key finding was that the S3G smartpilot has two pairs of Seatalk 1 inputs. The existing wiring used both ports, in essence depending on the smartpilot to link those inputs together. No problem with the pilot powered. But with its power off, the existing Seatalk 1 bus was interrupted, ie, those inputs were a series link in the Seatalk 1 bus. I fixed that so that the pilot is simply a tap to the entire Seatalk 1 bus using just one port on the pilot, now all good.

Kudos Chuck for all the support!